National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Light Rain

59°F

15°C

Humidity 93%
Wind Speed NE 10 mph
Barometer 30.11 in (1019.3 mb)
Dewpoint 57°F (14°C)
Visibility 7.00 mi
Last update 14 Oct 1:51 pm CDT
Extended Forecast for

Grayslake IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 63. Northeast wind around 10 mph, with gusts as high as 15 mph.

    High: 63 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 54 °F

    Mostly Cloudy

  • Thursday

    Thursday: Showers. High near 58. East wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 58 °F

    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 4am, then a slight chance of showers between 4am and 5am. Low around 48. Breezy, with an east wind 5 to 10 mph becoming northwest 15 to 20 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    Low: 48 °F

    Showers and
    Breezy

  • Friday

    Friday: Showers likely, mainly after 1pm. Mostly cloudy, with a high near 54. Breezy, with a northwest wind 20 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 70%.

    High: 54 °F

    Showers
    Likely and
    Breezy

  • Friday Night

    Friday Night: Areas of frost after 3am. Otherwise, partly cloudy, with a low around 35. Breezy.

    Low: 35 °F

    Partly Cloudy
    and Breezy
    then Areas
    Frost

  • Saturday

    Saturday: Areas of frost before 9am. Otherwise, sunny, with a high near 57.

    High: 57 °F

    Areas Frost
    then Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 63. Northeast wind around 10 mph, with gusts as high as 15 mph.
Tonight
Mostly cloudy, with a low around 54. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
Showers. High near 58. East wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Showers and possibly a thunderstorm before 4am, then a slight chance of showers between 4am and 5am. Low around 48. Breezy, with an east wind 5 to 10 mph becoming northwest 15 to 20 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Friday
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 54. Breezy, with a northwest wind 20 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 70%.
Friday Night
Areas of frost after 3am. Otherwise, partly cloudy, with a low around 35. Breezy.
Saturday
Areas of frost before 9am. Otherwise, sunny, with a high near 57.
Saturday Night
Clear, with a low around 39.
Sunday
Sunny, with a high near 64.
Sunday Night
Mostly clear, with a low around 43.
Monday
Mostly sunny, with a high near 67.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
1:26 pm CDT Oct 14, 2026
Forecast Valid:
2pm CDT Oct 14, 2026-6pm CDT Oct 20, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation